• Michael Shayne as The Cat in the Hat
  • Judy Taylor as Sarah Hall-Small
  • Roy Higgins as Mack the Turtle
  • Lillian Hubbard as Cindy Lou Who
  • John Logan as Joey
  • Rita Darling as Pam-I-Am
  • George Dolphin as Sam-I-Am
  • Sperty as Thidwick the Big-Hearted Moose
  • Sidney Arno as The Lorax
  • District Attorney John F. McGonagle as King Derwin
  • Judge Robert Walters as Horton the Elephant
  • Count Edmond Telmachio as Conrad
  • Warehouse Watchman as Young Cat in the Hat
  • Henry Randolph as Norval the Fish
  • Pop as Mr. Brown

See also

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